sealing one end of a If-inch tube and drawing it to a point. The 

 open end is flared somewhat to permit the tube to hang in the jacket. 

 The condenser tube is closed by a two-holed rubber stopper, through 

 which pass the inflow and outflow tubes. 



OPERATION. 



Place from 100 to 150 cc of ether in the jacket flask (A) ; put the 

 liquid to be extracted (100 cc) in the test tube (B), insert the funnel 

 in the same tube and suspend it in the jacket 

 flask, about 3 inches above the bottom, with 

 a copper wire which passes through the holes 

 in the test tube and is hooked over the rim of 

 the jacket flask. Insert the condenser in the 

 top of the jacket flask. The condensation is 

 usually so perfect that no ether vapors escape 

 into the room. The condensed ether drops 

 from the point of the condenser into the fun- 

 nel and is carried to the bottom of the test tube 

 whence it flows up through the liquid and over- 

 flows at the top. 



The efficiency of the extractor may be in- 

 creased by the use of a glass spiral attached to 

 the stem of the Gooch funnel, as described by 

 Kempf. 1 



II. APPARATUS FOR THE MEASUREMENT OF 

 AN EVOLVED GAS. 



The apparatus represented in figure 2 was 

 devised to give in a compact and easily ma- 

 nipulated form an apparatus which will allow 

 of the measurement of an evolved gas with- 

 out first sweeping out all air or other indiffer- 

 ent gases. It consists of a graduated funnel 

 tube (A), a reaction chamber (B), an absorp- 

 tion tube (C), filled with glass beads, a eudi- 

 ometer (D), and a leveling tube (E). A 

 heating coil may be wrapped around the reac- 

 tion chamber (B) when desired. The absorp- 

 tion tube (C), which is sealed onto the eudiometer, fits into the 

 reaction chamber (B) by means of a ground joint at (F). 



The manner of using the apparatus may best be illustrated by one 

 of the reactions which can be advantageously carried out in it. Spica 2 

 estimates citric acid from the carbon monoxid evolved by decomposing 



[Cir. 80] 



FIG. 1. Continuous liquid 

 extractor in operation. 



. Ztg., 1910, 34: 1365; Chem. Abst., 1911, 5: 1350. 

 2 Chem. Ztg., 1910, 34: 1141. 



